Simply the best, most reliable archiver around. In the next version it will support 7z file creation. Most of my RAR files are 4.4G on DVD, and I've tested larger files for the heck of it with no problems. Like others, WinRAR offers so many options, and being a mature program and format, it's rock solid.

There is very little difference between 7z Ultra vs. RAR Best, and when creating solid archives, RAR wins out every time. 1G game file was compressed to 501M using 7z Ultra (7-Zip) and took 5:55, whereas WinRAR Best compressed the same 1G file to 505M but only took 1:52 — less than two minutes, and less than a 1% difference in file size (on my 3.4GHz machine). Run your own tests. And in the next version, Roshal has plans to support 7z creation, thus continuing WinRAR's tradition of giving users the best of both worlds.